Toyota Tundra (2015 year). Manual — part 1621
A
A
REPAIR OR REPLACE FUEL SYSTEM
18.
CHECK FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were
present when the DTC was stored
.
FREEZE FRAME DATA ITEM
RESULT
SUSPECTED AREA
PROCEED TO
Coolant Temp
Engine coolant temperature is 40°C or less*1
Pressure regulator
A
Engine coolant temperature is 40 to 90°C*2
Fuel injector
B
Engine coolant temperature is 90°C or more*3
Pressure regulator
A
HINT:
*1: If the engine coolant temperature is 40°C or less (after stopping the engine and the vehicle is not driven for a
there may be fuel leaking from a fuel injector.
*3: If the engine coolant temperature is 90°C or more (2 to 5 minutes have passed after stopping the engine),
there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure
gauge and check the ability to maintain fuel pressure after stopping the engine.
B
GO TO STEP 20
19.
CHECK FUEL PRESSURE
HINT:
For the fuel pressure inspection, refer to the following procedures
.
(a) Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
Standard:
147 kPa (1.5 kgf/cm
2
) or higher (5 minutes after stopping the engine)
HINT:
If the engine cannot be started, read the values after cranking the engine.
Result
RESULT
PROCEED TO
Normal
A
Abnormal
B
A
GO TO STEP 24
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
A
B
REPLACE PRESSURE REGULATOR
20.
CHECK FUEL INJECTOR
RESULT
PROCEED TO
4000 ppm or higher
A
Less than 4000 ppm
B
HINT:
If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.
B
GO TO STEP 22
21.
CHECK FUEL INJECTOR
(a) Check the fuel injectors
.
RESULT
PROCEED TO
Abnormal
A
Normal
B
B
GO TO STEP 22
A
REPLACE FUEL INJECTOR
22.
CHECK THROTTLE BODY ASSEMBLY
(a) Check if carbon is in the air flow passage.
RESULT
PROCEED TO
Carbon in passage
A
No carbon present
B
B
GO TO STEP 23
A
CLEAN OR REPLACE THROTTLE BODY ASSEMBLY
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
OK
23.
CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leak
.
OK:
No leak in intake system.
NG
REPAIR OR REPLACE INTAKE SYSTEM
24.
PERFORM SIMULATION TEST
(a) Check if the engine can be started.
RESULT
PROCEED TO
Engine can be started
A
Engine cannot be started
B
B
GO TO STEP 25
A
END
25.
CONFIRM PROBLEM SYMPTOM
(a) Confirm the problem symptoms.
HINT:
The problem symptoms below can be determined by reading the freeze frame data.
PROBLEM SYMPTOM
SUSPECTED AREA
PROCEED
TO
The engine does not crank
Battery fully depleted
Starter (includes pinion gear
wear or teeth damage)
Starter system
Engine assembly (excess
friction)
Drive plate wear or teeth
damage
A
Abnormal cranking speed
Battery fully depleted
Starter
Engine assembly (excess
friction, compression loss)
B
There is no initial combustion (combustion does not occur even
once)*1
Pressure regulator fuel pressure
maintenance
C
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
A
PROBLEM SYMPTOM
SUSPECTED AREA
PROCEED
TO
Fuel injector leak
Fuel leak from fuel line
Fuel pump control system
Fuel pump
Spark plug
Crankshaft position sensor
system
Ignition coil system
The engine stalls after starter turnoff (engine stalls
immediately after the first time the engine speed increases)*2
Intake system connections
Throttle body assembly
Camshaft timing oil control
valve
Mass air flow meter system
D
The initial combustion and starter turnoff occur late*3
Engine coolant temperature
sensor
Mass air flow meter
Air fuel ratio sensor
Heated oxygen sensor
Fuel injector
Spark plug
Pressure regulator
Fuel pump
Fuel pump control system
E
HINT:
If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking
period, the battery charge may be insufficient or the starter may be malfunctioning.
*1: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be
malfunctioning.
*2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the camshaft timing oil control
valve may have a problem returning.
*3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or
too high).
B
GO TO STEP 32
C
GO TO STEP 35
D
GO TO STEP 51
E
GO TO STEP 58
26.
PERFORM SIMULATION TEST
(a) When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and
check that the starter pinion gear is not spinning freely.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
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